38 CFR § 21.156 - Other incidental goods and services.
(a) General. Other incidental goods and services may be authorized if the case manager determines them to be necessary to implement the veteran's rehabilitation plan. For example, a calculator may be authorized for a veteran pursuing an engineering degree, even though the veteran may not be required to have a calculator for any specific subject in his or her course, where there is substantial evidence that lack of a calculator places the veteran at a distinct disadvantage in successfully pursuing the course.
(b) Limitation on cost. The costs of incidental goods and services normally should not exceed five percent of training costs for any twelve-month period.