At least for Debian you can install Synaptic (you can download package once, transfer it, but do not install in a template, and from a template transfer it each time to a dispVM) in order to get arguably better visual preview according to your needs…
Although, I’m not sure if we are talking about gigs per month here, and each monthly plan should cover much more than that…
Setting a cacher qube would help you to spare bandwidth and it’s simple as