I started ebay shopping with buying cheap radio flash riggers I think (they work fine and sooo much more affordable than what local stores offer). Most things work great (e.g. the triggers, rapid strap, godox flash, reflector), but some less (bought a cheap ND, just to try it out and it was not so neutral and a center pinch cap for 0.99gbp seems to be too shallow and I'm afraid its going to touch the front element) so I'm still buying rather cheap things with huge price difference to similar items that can be bought locally, though some were over 22eur (none over 150 though) and I was never charged import tax or vat yet (I'm in EU as well).
Using ebay uk, my meike 6D grip was about 30euro including shipping. I thought about batteries for it as well, they can be bought for about 7,50eur and even state higher capacity, but there were some discouraging posts on the forum so I think I will go safe and get some from a local store.