Northern Ireland's online shoppers are facing fewer choices as big retailers like John Lewis, Dunelm and TK Maxx pause deliveries as the Brexit transition period ends.
As NI embarks on a new era in its trade with the EU and Great Britain on Friday, a consumer watchdog said there is "market uncertainty" for the public here.
The NI Protocol, which was agreed as part of the Brexit Withdrawal Agreement last year, is bringing in checks on goods coming into Northern Ireland from Great Britain.
And while rules have been introduced to ensure that supermarket goods like food and other supplies can continue to flow, at least in the short-term, there is no guidance on how the flow of parcels into NI from Great Britain will work.
With non-essential shops shut until at least February 6, more people here are shopping online. Online retail giant Amazon has told customers here to expect longer delivery times or that some items may not be deliverable at all to NI addresses.
Some NI customers who pay for Amazon Prime with the aim of getting goods delivered faster have already been charged £79 for a year's subscription.
However, it's understood the benefits of Prime will continue. Amazon said it is "making changes to processes in order to be compliant with the new requirements for shipments to Northern Ireland".
Discount designer store TK Maxx, homewares chain Dunelm and department store chains John Lewis and Debenhams have said they will not be delivering here as the system for ensuring parcel deliveries between Great Britain and NI from tomorrow onwards remains unclear.
However, a Dunelm spokesman said: "Our teams are aiming to have home delivery in Northern Ireland available by January 11 and are doing everything they can to potentially bring this forward."
John Lewis' website said: "Deliveries and collections are temporarily unavailable in NI as we make adjustments in line with new legislation. We hope to be back soon."
However, other big names such as ASOS, Next and Marks & Spencer have said they are still delivering to NI - though M&S indicated that deliveries may take longer than usual.
The NI Consumer Council said it's working closely with the UK Government to ensure guidance can be published on how parcels will be processed from New Year's Day.
Head of postal services Kellin McCloskey said the council "remains concerned that official guidance has not yet been published on how parcels between GB and NI are to be processed.
"This delay is causing market uncertainty, as some retailers are choosing to suspend services to NI until more information is available.
"If consumers have noticed a retailer suspending deliveries to NI, please contact The Consumer Council who is gathering evidence on this issue.
"We are working closely with the UK Government, to ensure this guidance is published as soon as possible and that parcel operators can still keep parcels moving between GB and NI come January 1.
"Published guidance on processing parcels between GB and NI is needed so Northern Ireland consumers know how this will impact the delivery of their recent orders as well as any annual delivery subscriptions they have signed up to from retailers and marketplaces."
HMRC, which is writing the guidance, said: "The UK Government will take forward a pragmatic approach that draws upon available flexibilities to implement the protocol without causing undue disruption to lives and livelihoods. We are engaging with operators to finalise these arrangements.
"These arrangements will mean that goods continue to reach consumers, while ensuring that goods at risk of moving into the EU market pay the duties that are owed."
Meanwhile, Secretary of State Brandon Lewis has said the UK-EU free trade deal - which was voted through in the House of Commons yesterday - will give Northern Ireland a "unique" opportunity.
"This is a deal that works for NI in a sense it gives NI a unique global opportunity, because NI businesses will have a position from which to trade that no-one in the world has got.
"That could be very good for business investment and job growth."
Mr Lewis also moved to reassure NI businesses that the flow of trade across the Irish Sea will continue in January as it has in December.
"Once we get into the next month or so and things settle down into the new year, I'm an optimist but I think people will see that the ability for business to continue to flow across the UK will be pretty static in a positive way but NI will be at the advantage of also being able to trade with the EU as well.
"This (deal) creates an opportunity for NI and I'm very much focused on seeing people in NI being able to benefit from improved jobs, opportunities and economic growth, something that NI needed before Covid struck as obviously the economy in NI was behind the rest of the UK pre-Covid."