Welcome Time!
Gung-ho makes the traditional hard-side *box* case for 2-5 guns. The 2 gun box has just enough space for 2 guns and a spotting scope mounted inside. The larger cases have removable trays that have *pinch* bars to hold the guns in place. Also more room for ammo and other accouterments of the sport. These run between $85-$125 in my neck of the woods.
Waller, Eagle, Dillon and Gunsite (just to name a few) market soft-sided range bags in various sizes and options. The better ones are made of ballistic nylon and padded with closed-cell foam. Most of these start at the $100 mark and go up with size.
Several discount firms, such as Service Merchandise, periodically offer similar bags on sale. The ubiquitous gym bag, generally lacks the strength of reinforced stitching and circumferential webbing; and lacks the various sized pockets to keep stuff from being a jumbled mess at the range. But, in a pinch they work at least as well as a big cardboard box.