Haven't checked the pricing on stickys lately, but last time I remember they were $50-600ish depending on the exact forum. Also some forums have at least a 6 month wait list. Another option would be a corporate membership which for $375 per quarter, you can post ads every 3 days instead of every 7 days.
Personally I'd go for the corporate membership... Didn't have the best experience when I purchased a sticky, more of a customer service issue.
I also heard they are sold-out for the next 3 years, so very unlikely you can grab one
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