The Spryte went for $8K.
Here are the other snowcat results:
2011 Prinoth BR350 winch cat with 12-way blade: $27,500
2007 Prinoth BR 350 with 12 way blade: $23,000
2006 Prinoth BR 350 with 12 way blade: $22,000
1996 Prinoth with 12 way blade (inoperable): $8,000
1982 Pisten Bully 200 with 8 way blade: $6,500