Stop it!....Behave yourself christine, and leave the tupperware alone!
You know full well Jacky and I are ebay surfers......So naturally, our far eastern friends have a cheaper alternative;
http://cgi.ebay.co.uk/67mm-White-Bal...1%7C240%3A1318
We've bought small items before from this seller. Factoring in about 2 weeks for delivery, but prices are good (available in all sorts of sizes)
Not sure if they still do them, but a few years ago a company called Omni (same folks who do the flash diffusers) were selling them here in the UK. Not sure if this helps, if people don't want to buy from abroad?