A while back someone was looking for magnetic reed switches. The Stasburg Train Shop has two sizes in stock. They do ship items from the store. ( not everything they have is on their website )
Allelectronics has them too.
And Mouser.
Ricky W.
HO scale Proto-freelancer.
My Railroad rules:
1: It's my railroad, my rules.
2: It's for having fun and enjoyment.
3: Any objections, consult above rules.
Tayda has them 1.5 amp for .39 or search ebay .