Cheap and good quality rarely go together. On3 is the least expensive of the "good" kits as far as a turbo. And it has taken them some years to get there but they are now.
For superchargers... Used S trim kit if you are on a mega budget is the go-to setup. Or find a car that already has one installed.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.