The Grobet USA files are def inconsistent, but at $2.50 each, I order double the quality and cull. Craftsman is happy to accept returns, but there's always a need for small triangular files in the shop, so they get used. I do very little of my own gunsmithing, but the fellow I have do my heavy lifting is happy to take what I won't use. The Geiswein 4" contoured wooden handles with brass ferrules are $1.10 each and handy for these little files...a little CA holds them until the file is toasted, then a little torch work breaks the bond for reuse of the handle and repurposing of the dull file.
TFWW carries a partial selection of Corradis, but does not carry the XXS; www.corradishop.com offers the 4" (as well as the other lengths) in XXS for 2.7 Euro each (and the 4-1/2" XXS for 3 Euro each), but the shipping charge is a flat 18 Euro (FEDEX three day shipping from EU to US...order on Thurs and receive it on Mon). Last order from them was their superb Corradi Gold rasps in 10" 10 grain and 6" 10 grain, which I prefer over the Auriou hand stitched rasps for the work we do shaping necks (if Corradi would narrow the cabinet rasp just a bit and taper a little more, it would totally replace my well-used Aurious 9" x 10 grain entirely) .
If predisposed to order a rasp or two (the 10" cabinet rasp in 10 grain and 6" half round in 10 grain is a nice combo) adding 10 each of the 4" and 4-1/2" XXS will bump the postage up by just 4 Euro over the 18 Euro FEDEX base charge.