Metabo HPT G12SR4 4-1/2" corded grinder with case and five grinding wheels $29.97. Basically, if you currently own fewer than three angle grinders, you should buy a couple of these to help you pretend that you're not a gay. Note that these are the same as the Hitachi G12SR4 and were rebranded due to some corporate shit; they are not true Metabos.
If you want a grinder that looks like a John Deere/Decepticon mashup and says Popoman all over it, clip the $20 coupon on the product page and use code 40Q6ZU38 at checkout to bring this down to $57.99 for a Popoman brushless cordless 5" grinder with a battery, charger, and five grinding wheels. It doesn't have any reviews and is probably a piece of shit, but if you cared about that you wouldn't be buying a Popoman.
If you're grinding on a budget and are somehow both confident enough in your masculinity to rock a chartreuse grinder and have the low level of self esteem that enables you to live with mediocre grade power tools, this Ryobi deal might be for you. Get a Ryobi P423 18-volt ONE+ brushless 4-1/2" grinder, two batteries, and a charger for $99 down at the Depot.
You know, I almost had a little spaz because I realized that Ryobi is pictured with a type 1 guard on it and I thought they were selling it as strictly a cutoff tool, but then I checked the product description and it turns out it comes with both a type 1 and a type 27 guard, which is a real nice feature. I sometimes get a little disgruntled about Milwaukee grinders, because they include both guards on the cheapo regular M18 grinder but on the Fuel models you only get the type 27 guard. I'm going to upgrade the Ryobi grinder above from mediocre to a B-.