Wow, I'm glad I bought mine about two/three weeks ago, it was only $140. After shelling out $200 for the 86mm B&W Kaeseman for my Bigmos, I don't think I'd want to dump another $200 for the 77mm. I must have just skidded by before they raised the price. But, I've said in the past, if you spend that much on a lens, you should spend a fair amount on accessories. After paying $1800 for the 28-300mm L, I figured $140 for a filter wasn't a bad price to pay, especially considering how perfect the B&W filters are.
Plus, good filters, and the B&W filters are great, are going to be pricey.