Whichcraft - Only true bottleshop in town. Sorta north in Mueller ( has 40ish taps of beer as well).
East 1st Grocery - East of downtown, a gas station/convenience store bottle shop. Solid selection.
Sunrise Minimart - Another gas station bottle shop on the north side.
Southwest Parkway Market -Convenience store/ bottle shop with a large selection of Belgian style and rare beers.
The Brewtique - featuring grab and go mix and match six-packs in Cedar Park
High Country Market - Part bottle shop, part bistro in Round Rock.
Any Whole Foods - Downtown location is best if you are staying downtown, but the Domain location also has a 40 tap beer bar in it.
Any Central Market location - Like Whole Foods, but they always have a wide selection of beer..
The rest of the shops on the map range from places that have a wide range of great beer to places that I have not been but have heard get solid selections.
Note: Spec's and HEB were not included on this map. Most Spec's will have a solid selection, but check dates on them. HEBs can be hit or miss, depending on the neighborhood. I left HEB Mueller on solely because it always has a good selection.
If you have any recommendations for places to be added or deleted, send me an email at firstname.lastname@example.org or message me on twitter at @andrewlschwab.