Buying algorithms vs. Programming Algorithms

I was wondering if anyone had any opinions on buying algorithms vs. programming them yourself. Especially for complicated mathematical algorithms, is it cost effective to subscribe to an algorithm library for about $3000 per year, or let your programmers do all the work? The algorithms are supposed to be tested and there is technical support for helping add them to your programming. If you have any informed opinions of experiences in this area, I'd love to hear it.
Thanks, Steve Chastain

You can select programming algorithms as it's more effective than buying algorithms and as per cost it is more reliable too.