Seems like to get a good one under $100 you'll need to catch a good sale...usually on a model being replaced with something newer. A lot of these are good quality, with enough user reviews that you might find a good one.
I get emails from Midway USA with lots of cam sales, and we have a great local hunting and fishing store with lots of models going on sale, as well as Bass Pro nearby.
I have a low cost Browning that I like a lot, haven't tried videos on it. I've had some great Moultrie cams, but also some dogs that leaked every time it rained.
Probably the best quality cam I've used is a Moultrie cellular cam XV-7000i...but I do have to pay them a monthly fee for the cell transmission of photos...a good deal since the cam is installed over 100 miles away...requires 12 AA batteries since it is taking pictures and also transmitting them. Normally it transmits lower quality pix, to save on data usage, but you can retrieve a high quality pic of any that you want...stores them on their cloud, and sends you an email when you have new pix...even tells you that it is buck or doe or turkey. You can also see the battery level and the cell network strength on the website. I've been impressed with its trigger speed, and battery life, installed it last August.
Good luck.