Get a network card for your machine. AmiKit have them. Then setup samba on the amiga, and it will show up on the mac as a PC (gasp!).
Or, get Buddha IDE controller and a cheap IDE ATAPI CD Burner. Then you can burn the data.
Or, you can get a USB card and use a memory stick.
I guess the CD Burner is the cheapest and most flexible way. You might also get a cheap seconhand scsi burner of ebay, and then it's eaven cheaper.
The excellent MakeCD for the amiga is free these days.
