You may find S-K at independent tool specific stores (not HF) or from tool "jobbers" that visit shops. Some jobbers may carry MAC or MATCO tools. Those brands are also well made and carry lifetime warranties. If you know a mechanic that works in a shop ask when those jobbers visit the shop--usually on the same day of the week, each week. HF tools are ok but the fit may not be ideal. I use them for "at the site" repairs where they may get lost in the dirt.
Tools are expensive--there's no getting around that but keep in mind, a well made tool can last a lifetime. I still have most of a set of 1/2 inch drive sockets, ratchet and extension my mother gave me for my 16th birthday (using "Green Stamps" from the grocery store! Thorsen brand) - I'll be 72 this May. -- Dave