As I've found over the last year, the RAM board is not rare but people are holding on tight to them and asking crazy prices or suggesting swap deals that have been insane.
The downside of not having the RAM board is that the VXL is the same speed as a stock A500.
So I said enough was enough and picked up two 68010 for dirt cheap. Anyway I refuse to pay 100x more than what a piece of hardware is worth. Ebay is a prime example, with the exception of a couple of traders i.e. airey36.
Anyway I wish you luck, maybe you'll have more than me trying to obtain the RAM board :-)