If you've given up on ever finding the gems from the China Glaze OMG collection or are in the market for a GOSH holographic dupe then The Makeup Store in Westfield shopping mall, London stock some fantastic alternatives.
They're £11 for a 8ml bottle which is quite steep but if you're a holographic lover it's totally worth it. Yesterday I picked up Britta which is a pink linear holographic out of the 5 they had.
The holographic-ness is blinding (my photography not-so!) and even a coat of Seche Vite didn't really dull it. Application takes a bit of getting used to as it drags and balds if you use too much at once. I found if you do one quick stroke then leave it to dry before doing the others works best. I think I applied about 3 coats in total. There is a base that goes with these but I didn't get it so am unsure as to whether it would make application easier.
I had never heard of this brand before yesterday but I was informed it has been around for 15 years and originates from Sweden. I don't think these are available to buy online but you can place an order over the phone providing you spend over £30. I'll be saving my pennies to buy the others!
UPDATE: I found a GOSH fix base in my local Superdrug and tested to see if the application of this polish would be better and I have to say it is. The polish goes on smoothly, doesn't drag and there is minimal balding. So because of this I highly recommend using a base. I'm glad I put off buying the from The Makeup Store because the GOSH is so much cheaper (£4.99).