Brownell's is the best on price, if they have them in stock. However check to see if your front site on your 225 is dovetailed, if not you may not be able to us XS sites, as the some stamped slides do not have enough meat, to cut a dovetail correctly in them.(I had this problem with my early 220 Sig). You might want to check with XS customer service if you need to cut a dovetail, and if you can do it. The XS customer service is great, since i could not use the sights for my 220 I bought, and they had never been filed on, they exchanged them for sites for my 229 Sig.