They are still available through Baldor, I believe. The cost? Baldor-ific - $108 for the left one on my 8107W and mine doesn't have the dust pickup that yours has! What do you expect from a company that charges $50+ for a two-pole single throw toggle switch that can be had locally for under $10?
Amazingly good grinders though - I bought mine at an estate sale for under $100, in super condition - won't find that deal again.