I’m not sure what you mean by transition strips, particularly since you don’t mention what kind of material you are using. In any case, I urge you to contact one of the flooring retailers on First Ave. in Sodo. We used the one directly across from Starbucks HQ (and next to Pho Cyclo) so you can have a terrific lunch before or after talking flooring) that handles a wide variety of flooring and related supplies. Fairly reasonable, too. (Sorry, can’t recall their name.)