self dealing

When someone wants to be a pig and cash in on what you already got going for yourself.

"Wow. I thought the mofo was honestly wanting to help. But his self dealing antics got in the way to having good sex."

deal-hunter

A person who searches for the lowest price of a product or a service (usually online) making use of discounts, promos or coupons. The common practice is that they buy stuff at an unusually low price for the product's worth, whether or not they actually require it.

The deal-hunter stacked up some coupons over the usual discount to buy the mobile phone for just 120 bucks.

I deal-hunted and bought a earphone for just 5$ - I've already got 2 such and dunno what I'm gonna do with this.