I am looking for a good price on dichroic filters

I am looking for a set of dichroic filters like 2pc 15mm dichroic filter/mirror (combine RGB laser) [M0048] - $27.99 : Modwerx Shop these are $30 anyone have a better price? It just seems like a lot for colored glass.

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Edit: By the way, dichros are not simply colored glass, they are glass (or other material) with a thin-film coating. It is a somewhat expensive process to coat glass with a thin layer of a certain material (at least, initial cost is high - for machinery - mass production makes everything cheap, but precision optics for lasers doesn't have a massive market).