I bought this about 7 years ago, from the same seller, I think, and the price is still the same. The crystals were lily white, as they should be. Assuming it's the same stuff, it's the best deal I've seen on EBay.
https://www.ebay.com/itm/Stannous-Chloride-Anhydrous-99-8-1-4-lb/312026816682?hash=item48a63f60aa:g:VRcAAOxyoahSWxR~
The 1st time I made stannous chloride, maybe 30 years ago, I made it according to the Hoke book and put mossy tin in it. Worked fine with some fiddling, but, since then, I just made it up fresh, when I needed it and maybe use it for 2 or 3 days. Takes about 1-2 minutes to make it. A gram of stannous chloride, 15 ml of HCl, and 15 ml of water, in a 100ml beaker, with a glass eyedropper in it. If you want the 1/4 pound (113g) to last 10 times longer, you can cut the makeup down to, say, 0.1g, and use 1.5ml of HCl and water. You only use a drop or 2 per test and there are 15-20 drops in a ml. Instead of weighing and measuring, you can eyeball it. If there is some HCl in it and it all dissolves, it will work. Out of habit, I still test it with some gold solution. Make sure everything is clean. If you use the Hoke method, don't put it in a bottle with a rubber bulb, as I and some other forum members did. The gases from the mossy tin slowly dissolving will expand the bulb and it will blow, as mine did.
I always use a white 12 cavity spot plate. I first add a drop of the solution I'm testing and then a drop of stannous chloride soln. With gold, it will usually turn a fairly permanent purple or near-black. If it turns purple or black and then this color quickly disappears, there is a lot of free nitric present. In that case, I make a new test with 1 drop of the soln. being tested, plus 2 or 3 drops or water, and finally 1 drop of stannous chloride soln. The water dilution tends to kill the adverse effect of too much free nitric and the purple or black color will be retained.
I never saw much sense with messing with tin solder, when the stannous chloride is so cheap. Store the stannous chloride crystals in an amber bottle, sealed in a dark, cool place, for best shelf life. You don't want the color to change from the lily-white.