I haven't used anyone on eBay, but my advice would be to buy one to see what the quality is like and check out the feedback.
I bought my bridesmaid's skirts online and did that, with great results.
If you're concerned, maybe email the seller/shop first to make sure that they will keep getting the item you want in stock, so that you don't buy one and then they don't get it in again. When I first looked at skirts, I was 'watching' a few, and they sold out and disappeared! Be warned - this seems to happen a lot with products from China.
Hope this helps!