Objective:

Quickly and easily quote non-standard sizes and grades of welded pipe and tube.

Methodology:

1.) Contact a custom tube fabrication shop with the grade, size and quantity required. Ask for fabrication cost and delivery, as well as required input stock - sheet or plate depending on wall thickness.
2.) Source the input stock based on the fabricators requirements
3.) Combine fab and stock prices, plus logistical costs, markup and quote the job.

Considerations:

A.) Be very careful about the specification required on the quote. Only certify to the specifications of the sheet or plate being used, unless the fabricator is offering to certify to a pipe or tube spec.
B.) Be completely transparent with you client about exactly how you are providing the material being quoted. NOT mill produced product.
C.) Be extremely careful to pass along any notes regarding tolerances and specifications as spelled out in the fabricators quote. Include all details in your quotation to your client.
D.) Only go after items where the wall thickness is one that can be sourced in sheet and plate.

Recommended Fabricators > 2” OD:

Offenhauser - Houston (800) 228-4811 - Talk to Russ Dillard - russell@offenhauser.com 
Mach Corporation – Houston (800) 231-6823 Talk to Denise - dsewell@machindustrialgroup.com
RAM Industries – (800) 881-1223 - Although they can work most any alloy, they stock and fabricate lots of Grade 2 titanium. 

Recommended Fabricators < 2” OD:
Tech-Weld  - Chicago – (800) 521-8823
Evans Metals- Los Angeles – (714) 373-2515