These aren't the exact model of yours but they are all large bore carbs. You can probably find them cheaper if you keep a eye out but this might give you a idea of what to look for.
1987 https://www.ebay.com/itm/1987-Evinrude-30-HP-Carb-and-Primer-BM56C-/252040545181?hash=item3aaec9839d:g:5w8AAOSwLVZVt5-O&vxp=mtr
1990-91 https://www.ebay.com/itm/0432701-Carburetor-20-30-HP-Johnson-Evinrude-OMC-1990-92-0439375-432701-/401126439160?hash=item5d64ffb8f8:g:bUkAAOSwNsdXRcHD&vxp=mtr
1994-2005 https://www.ebay.com/itm/Johnson-evinrude-outboard-30hp-OMC-carb-carburetor-2cly-25hp-35hp-/121974634751?hash=item1c664138ff:g:vXsAAOSwDuJWzaXa&vxp=mtr