Just get the Wondfo 20-25HCG test from Amazon or Ebay...I paid under $10 for 100 of them, lol
Someone already suggested them to me. Not in the UK unfortunately. All I could find was 2 for £7 (approx US$11)!!
We only seem to have the ICs or the really expensive Clearblue/First Response etc. Own brands from supermarkets are a bit cheaper but not much.