Supply has been difficult fido.
As far as I can see - all just from my own experience please note! - lowish value parcels sent over by Royal Mail seem to get over OK (all parcels have to have a value declared before sending, and shown on the customs sticker which is obligatory at the UK end).
Parcels through UPS and DHL etc have been subject to horrible delays, which may or may not still apply. Their hubs were backed up with weeks' worth of stuff, and a fair amount got lost. Wassell, the big trade dealer, suspended all deliveries to the EU from the UK for a while, and I believe there are still some countries to which they won't send.
As to costs, you'll be liable to VAT at your local rate, as VAT isn't charged in the UK by traders sending into 'third countries'. And there will often be an administrative charge for handling, and on some things possibly customs duties as well but I don't know quite how that works.
The net of it is that costs have risen by as much as 50% on a whole lot of orders.
I think the threshhold at which the local Customs people get interested is about 140€ worth of declared value, but I bet that 'all depends' and I may have that wrong anyway.
The very few things I've received in France since January have been low value, Royal Mail-ed from UK, and have arrived quickly and without additional charges or VAT being demanded. But I expect it varies from EU country to EU country, and I wouldn't ever like to try to guess what a bureaucrat will do in any given situation.
But one thing is for sure - it's got a whole lot harder. More expensive, more complicated and in many cases slower.
I'm holding back on ordering anything expensive for the moment - and making do with the toys I've got the way they are.
Of course, Britih Only in Austria is there - although costs of goods inwards to them from the UK will have gone up, and there's De Groot in the Netherlands. Quite a lot can be had that way . . . and it may actually be easier to order through them, and let them worry about the paperwork!