So?? £30 is a lot of money for me too,but for what you want to do it is neither here nor there and if anyone has followed my builds here on Hexus,you would have seen the lengths I have gone to save a few quid. I even have a rummage around to see what I can ditch to pay for parts of the build. I don't have much of a budget either.
Even I have realised at times,you might as well save up for a while to get something better which is a better use of your money. Stop-gap solutions might be nominally cheaper initially but in the longterm you just waste more money IMHO. Even my current PC was built over six months and I needed a new one,ie,the old one was starting to have problems and it was nearly 5 years old. I could have spent less on repairing it but in the end it was just throwing away money in the longterm and this is considering I keep my hardware for years and always try to re-use it.
I just gritted my teeth and put up with having a semi-built PC,and even now I would love a new case and a cooler but I have no budget for that. I will save up for that.
However,in the end if you cannot budge even £5 to £10 over £30,then it is better to either wait a few months and save some money and failing that look on Ebay. If you have a limited budget,patience is needed.