I almost didn't list Swagbucks here because, while it's a great rewards site, they list in their terms that you can't expect for up to 10 days after you cash out. However, it's still an option to earn fast cash because some people report getting paid much faster than this. You can redeem you SB (Swagbucks) for Amazon codes, Paypal cash, and gift cards to popular merchandisers among other things. These points build up quickly thanks the the large number of things you can do on the site to earn. I've used this site and been paid many times.
If you have done any amount of shopping online, you have probably seen the “Pay with PayPal” payment option at the checkout screen. You can add these own buttons to your website with PayPal or use an online shopping cart like Shopify that will automatically deliver your digital products and drop ship physical goods you keep in a distribution warehouse.