 Breaking the bank with the return of all-day $2.99 Wacky Packs. Plus, get half-priced drinks and slushes every time you order online or in the Sonic app. Add-ins cost extra. Duval's Affordable Portable Buildings is the River Valley's oldest full-service portable buildings dealer. Seven years and counting. And without customers like you shopping local and leaving honest reviews, well, Duval's Affordable Portable Buildings wouldn't have an A-plus rating from the Better Business Bureau.