Also, the BHMT (betaine—homocysteine S-methyltransferase) is a backup pathway to the folate-methionine-homocysteine cycle. Supplementing with trimethylglycine (a/k/a betaine) will activate this pathway, and essentially bypass the need for folate. The reason I mention this is because trimethylglycine can be purchased for as cheap as $0.07 a tablet; it's a by-product of sugar beet processing.

I would recommend tackling the problem from both sides, perhaps 1000 mcg of methylfolate combined with 1000 mg of trimethylglycine, this would get the costs down to $7 a month for you.

In the diagram below betaine is another name for trimethylglycine. DMG is dimethylglycine. BHMT takes trimethylglycine and converts homocysteine back into methionine by taking a methyl group from it. Dimethylglycine is leftover.