Yeah they don't really exist. There have been some versions for previous generation chipsets but I'd assume AMD discouraged them as they want to push FM2+ as their cheap/small solution. Makes sense I guess, you want integrated graphics on a lot of ITX usages.
Basically trying any kind of mid-high end AMD build at anything below ATX is a bit of a dead end - the AM3+ mATX boards exist but they are all complete rubbish.
You can either stick with AMD and try the FM2+ route. The 750K/760K are a solid entry level CPU for most tasks, there's not a lot of options outside of that really.
Or you can go Intel. The direct competition is i3 family, though depending on what you need you can make a case to step up to an i5 (Intel motherboards can...