I’ve posted another project for those of you stuck with 9V or 12V Lego trains force to pay very steep prices on eBay for additional track (especially the straight track!). Head on over to the projects page to check it out. Ultimately it’s a pretty simple solution, you just need the aluminum flashing tape used commercially during building construction and cut into strips or stain-glass-makers copper or aluminum foil tape, stick it down on the tracks, smooth it out and it works out perfect.
Do they have it Home Depot
Yes, they should have it at Home Depot, if you call it aluminum tape they should be able to point you in the right direction, it’s usually in the HVAC area, but they likely don’t have thin stuff, you’ll have to cut it down to size.