INDIVIDUALS can buy back issues of Western American Literature—available from fall 1997 (32.3) to the present (with some exceptions of issues out of print—see below) from the University of Nebraska Press:
https://nebraskapressjournals.unl.edu/journal/western-american-literature-a-journal-of-literary-cultural-and-place-studies/

LIBRARIES must order by calling 866-978-0295, Monday through Friday, 8:00 a.m. – 4:30 p.m., Eastern Time. Visa, MasterCard, and American Express are accepted for phone orders.

Please send mail orders to
University of Nebraska Press
                c/o MPS Limited
                941 West Morse Blvd, Ste. 100
                Winter Park, FL 32789

Be sure to clearly indicate what you are ordering (which journal and, if a back issue, which issue). Include a phone number or email address in case there are questions.

Be sure to specify the issue you are ordering and include your complete mailing address and a phone number or an email address where you can be reached if there are any questions about your order. Orders must be accompanied by payment in the form of a check drawn on a US bank or credit card information (Visa, MasterCard, or American Express).

Back issue prices for issues from the most recent volumes:

for individuals: $16.00–$17.00 plus shipping and handling
Institutions: $40.00 plus shipping and handling

Shipping and handling charges: Please check with the University of Nebraska Press.

The following issues are out of print:

1.1
9.1
9.4
11.2
12.1 + 12.2
14.1 + 14.3
15.1 + 15.2 + 15.3 + 15.4
16.2 + 16.3
18.4
19.3
21.4
22.3 + 22.4
23.3
24.1
25.4
26.1
27.1 + 27.3
28.1
29.2
33.3
34.2