B&H has some excellent deals on VU brand filters. They have neutral density, UV, and circular polarizer filters in an array of sizes — from 37mm to 105mm. Although these filters are super-affordable and highly discounted (starting from $2.05), they look to be of decent quality and made from Schott glass — a great value for the price.
B&H: VU Filters (UV, ND, CP) from 37mm to 105mm, Starting at $2!

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Thanks for posting this. A couple of years ago I saw Vu ND filters on-sale and gave them a try. I found they had less color cast than the Hoya ND filters I had been using. After that, Adorama had a sale on Vu filters and I bought a bunch because they were so inexpensive. These B&H prices are even lower, so I’m checking my inventory and buying the remaining sizes and densities I can use that I don’t already have.
Wow! B&H doesn’t have many reviews on the Vu filters but reviews elsewhere seem to be very positive. Thanks!