However much you can afford, it's surely not about the amount but the thought behind it - or am I being insanely naive for a woman in her 70s?! Our son inherited a box of bits and pieces from my father - nothing of any great value, except for a vintage Hamilton (American) watch which no one seemed able to repair. DS was eager to wear it and asked us if we could find someone in London who might be able to fix it. Searched high and low, in London and throughout the UK on the internet. No luck. The necessary part was simply not available in the UK.
I am nothing if not determined, so I widened my search and found someone in the northwest USA who said he could fix it - for £150. Did I dare trust him/the US postal system, etc and send it? Well it wasn't any good as it was, the website seemed genuine and brief correspondence confirmed a positive feeling, so I took a chance.
Watch repairer delivered as promised and DS was delighted to get his grandfather's working watch for his 40th. He wears it daily, it keeps excellent time and he and loves it!