I haven't played in a while but from what I can remember you can get basic skill gear inside as well as selling almost any items.
Most of the towns in runescape have a general store.
the general store
Simons General Store was created in 1873.
Mikulich General Store was created in 1923.
Barker General Store was created in 1847.
Manion's General Store was created in 1915.
Prince Brothers General Store-Berry Store was created in 1900.
The cast of The General Store General - 1920 includes: Bud Duncan
store the items
Feraud General Merchandise Store was created in 1903.
Felt Cobblestone General Store was created in 1835.
Lost River General Store was created in 1898.