CMoy kit or component help (UK)

I've purchased some DT770s and want to build a cheap amp to go with them however finding it very difficult in rip-off Britain! The best I've found is Fernells however at the prospective price for parts I'd be much better off buying a pre-built unit from eBay and paying to get it sent to the UK. Maplin although cheaper doesn't sell the OPA2132 op-amp which seems to be most commonly used in CMoys although I could probably pick up the rest of the parts there. Is there anywhere in the UK where I can pick up all the parts I need (minus a case) or anyone here who sells a CMoy kit? It needs to run off of a single 9v battery because I plan on wiring up a DC jack for desktop use as well.

Looking at cases would I be able to use these or would I have to use these, the latter seem to be the commonly used ones so I guess there is some height issue from the caps?

I checked that bit for alternatives but the selection at Maplin is quite poor to be honest and it's been quite a while since I designed a circuit for anything so I'm not entirely confident in my ability to design one for a different op-amp yet. I looked specifically at the OPA2132P(A) so there were fewer deviations from the standard CMoy but a little tweaking here and there shouldn't pose too much of a problem.

I didn't check Digi-key because the CMoy parts list directed me to the US site (which I assumed would be expensive delivery) and didn't realise there was a UK site too. I chcked it last night however the delivery cost is still rather high at just less than the parts cost (£12 delivery, £19 for the parts). I'm going to see if anyone I know would buy a built unit from me as an order at £50 delivery is free so it would save me a bit.