I have bought new blades for a wave from the states through Etsy and from Russia from eBay.com (USA).There is a guy on here think he is called Loki who sells leatherman parts.I think as long as your wave is a next gen or wave plus a s30v blade from a charge TTI will fit.
So you want better steel than the standard blade?
I will have to check etsy Are the s30v blades better at holding an edge?And thanks