Sorry for the thread hijack, but this has been driving me

and this thread seems like the closest thing I've found to my problem. Hopefully, someone here will have some ideas before I gnaw through my own foreleg...
Let's say I sell widgets, gadgets and gizmos. Widgets are 2lbs each, gadgets are 11lbs and gizmoes 21lbs. I ship to regions A, B, and C. Anyone who orders from region D is outta luck.

Shipping is as follows:
widgets:
1-6....$10 to A, $13 to B and $18 to C
7-12...$20 to A, $26 to B and $36 to C
13-18..$30 to A, $39 to B and $54 to C
Etc, etc, etc...
Gadgets:
1......UP TO: $15 to A, $17 to B and $25 to C (depending on specific area)
2......UP TO: $19 to A, $23 to B and $38 to C
more...$3, $4 and 9$ per unit above 2
Gizmoes:
1......UP TO: $19 to A, $23 to B and $38 to C (depending on specific area)
2......UP TO: $28 to A, $35 to B and $66 to C
more...$6, $8 and $18 per unit above 2
Any suggestions???
