I hate to see a post languish away from lack of responses so...
If this question is for the trigger guards with hinged floor plates:
Midway carries a good selection of trigger guards although it seems to be limited to PTG and Remington factory. I have used a couple of hundred of the PTG Oberndorf trigger guards with the hinged floor plate and I've been very happy with these.
You can check Sunnyhill but be sitting down when you see the prices.
There are probably others but you can use a good search engine to locate all of the ones you might be interested in buying.
If you're asking about DBM models and prices, a decent search engine will give you a list to work with.
i guess my response goes the other way........find a seller who supports this fourm, or at least supports the shooting sports in general. I have no problem paying extra to support our community.
If you want a triggerguard/floorplate vs a det mag set-up. Some of the stock providers sell products. Christen arms has aluminum bottom metal and det mag set ups. Broz showed a trick carbon fiber magazine det mag set up when he compared the 300win to the 30 nosler. I didn't catch the mfg but it was within a few ounces of a floorplate set-up. It also had good length for longer cartridges similar to the wyatt's box setup, Search for that video either here or lro