humm tricky one this here"s some short ideas...
1> ...start looking at top end spec ones on the internet and when she starts to moan about the cost, point out its this ready built and shiny for not lots of money, then say "id love that shiny one, but your right darling ! ill compromise and make my own for lots less money" outcome.... she will think your serious about spending lots of cash and take damage limitation, you get a toy
2>...Take a leaf out of her book she says "we need xyz"... your replay "No! you have/had/ don't need one of xyz , like i don't need my toy" outcome....this will inject arguments and lots of excitement followed by lack of sex and sleeping on the couch
3>... Tell her everyman needs a hobby, like every woman needs to moan its biological outcome..... not much
4>... put on your manliest face, puff out your chest and say am doing it, and if you don't like it lump it ( DO NOT SHOW FEAR THEY CAN SMELL IT) outcome.... you have a nice play toy, disposable income, a new home on 2 wheels and a thai bride who used to be called "Bob".
id selected a combination of 1 and, 2 the key is perseverance ! ............but at the end of the day a relationship is a 2 way street, she should give u things that will make you happy too.