OH might be tight on everyday things but he goes overboard the other way for Wil. This is what he has bought Wil for his birthday
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=270725370509&ssPageName=STRK:MEWNX:IT
My niece has the same one and Wil loves playing in it so he will be made up with it.
My parents are contributing to it and any money MIL and FIL send will go towards it too because I don't want Wil having massive amounts spent on him each birthday so he comes to expect it.
He had a swing for the garden last year (£100) and then OH went out and spent another £100 on a bouncy castle.