I've checked Home Depot and Lowes and have never come across them. I bought the 3.8mm and 4.5mm game bit drivers from Parts Express via mail order back in the mid '90s and they still work great. A couple of years ago I found the drivers at Micro Center as part of a $30 screwdriver tool kit made by Pro's Kit. Everything in this kit was well-made except the two game bit drivers. The teeth of the drivers were not formed well (they're too small) so they don't fit in the grooves of the screw head. For other consoles the tool kit works great, but for Nintendo and Sega cartridges (haven't taken anything TG/PCE-related apart yet) I'm still using the old bits from Parts Express.