લેવા ગયો બકરી, ખાઇ આવ્યો ઊંટ.

lēvā gayō bakarī, khāi āvyō ūṁṭa.

Literally: He went to buy a goat, but ended up eating a camel.
What it means: Said of someone who set out on a modest errand but incurred enormous expense or loss instead.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.