The ProTalk Q Communication Module HART Multi-Drop Master Part# PTQ-HART Module is a product of ProSoft Technology, Inc. and you would need to contact them for price and availability. Below is the contact information.
ProSoft Technology, Inc.
5201 Truxtun Ave , 3rd floor
Bakersfield, CA 93309
Tel: +1 661-716-5100
Fax: +1 661-716-5101
info@prosoft-technology.com