Hi jenny,
This info comes from Blue Roses awesome awesome awesome ebay G1 price list..
http://www.angelfire.com/oh5/bluerose9978/PRICE/The first price is the average the pony sells for on ebay, and the lowest and highest the pony has gone for over the last 4-5 years. Hope it helps you out.
*Gusty $10.66 (March '09: $19.46/July '09: $4.75)
MOC Gusty $84.63 (Sept. '12: $146.49/Jan. '13: $46.05)
SS Gusty $17.78 (May '09: $27.80/June '09: $5.50)
UK Gusty $11.31 (May '09: $17.28/Oct. '09: $6.00)
*Argentina Gusty $83.45 (March '10: $149.99/Oct. '09: $26.99)
Brazil Gusty $166.64 (June '09: $359.99/Oct. '09: $46.00)
Brazil CP Gusty $307.62 (Feb. '09: $1,009.99/May '11: $32.56)
Italy Gusty $37.63 (Nov. '09: $51.00/May '10: $7.49)
BBE Baby Gusty $3.95 (March '09: $5.74/June '09: $1.99)
NBBE Baby Gusty $59.37 (Sept. '09: $90.30/Aug. '09: $41.45)
Sparkle Baby Gusty $6.96 (Nov. '09: $14.99/Sept. '09: $2.99)
MOC Sparkle Baby Gusty $32.83 (June '10: $59.00/Sept. '11: $15.00)
Brazil Baby Gusty $229.08 (April '13: $599.00/Nov. '11: $132.50)
Also, I sent you a message on your other gusty post about an italian gusty I have who is looking for a lovely new home.
xx good luck on your gusty quest!