(a) Each person purchasing any mobile home at a sale under this Act shall pay to the county collector, prior to the issuance of any certificate of purchase, a fee of $20 for each item purchased. A like sum shall be paid for each year that all or a portion of subsequent taxes are paid by the tax purchaser and posted to the tax judgment, sale, redemption and forfeiture record where the underlying certificate of purchase is recorded.
     (b) The amount paid prior to issuance of the certificate of purchase pursuant to subsection (a) shall be included in the purchase price of the mobile home in the certificate of purchase and all amounts paid under this Section shall be included in the amount required to redeem under Section 300. Except as otherwise provided in subsection (b) of Section 240, all money received under subsection (a) shall be paid by the collector to the county treasurer of the county in which the mobile home is situated, for the purpose of an indemnity fund. The county treasurer, as trustee of that fund, shall invest all of that fund, principal and income, in his or her hands from time to time, if not immediately required for payments of indemnities under subsection (a) of Section 245, in investments permitted by the Illinois State Board of Investment under Article 22A of the Illinois Pension Act. The county collector shall report annually to the county clerk on the condition and income of the fund. The indemnity fund shall be held to satisfy judgments obtained against the county treasurer, as trustee of the fund. No payment shall be made from the fund, except upon a judgment of the court which ordered the issuance of a tax certificate of title.