i have some of those from a different deck. i never really see them sell anywhere or at my local card shop and even back then, i always assumed they wouldn't hold up in value bc it's not The Real card and is just a reprint with a different border, no holo, and a signature from the person that played that deck. i have a hard time finding them selling online too, but the few i found listed weren't going for more than a dollar, some less than 50 cents. they aren't tournament legal so people that play the game likely won't buy them and the real cards are more valuable than those, so that deters the hardcore collectors. you'd have to find someone that specifically likes to collect those, and that's probably really niche.
so basically, i can't find anything on them, but i'm just making an educated guess in that these types of cards don't sell for much and are not really sought after by players or collectors, unfortunately.