18mm rims - tubular tires

I have just picked up a nice set of vintage track wheels (campy hubs laced to 18mm assos tubular rims). I wanted to know if anyone has any recommendations on affordable tubulars for them in that width and if so where I might get some from? (I’ve checked in with Beaseleys and they are quoting around $200 per tire - ouch!)

these look good:

http://www.kookiebikes.com/store/product.php?productid=119&cat=17&page=1

are you sure they need to be 18mm tyres?

Not entirely sure but the rear rim has a clapped out old continental tire on it that will need to be replaced which is 19mm so I am assuming 19mm tires will work out fine.

I was considering some Vittoria Pista Evo CS’s via PBK as an option.