[Moving right along; feel free to continue to plan/ask Aldus questions/etc.]
With the basic plan in place, the group slips out of the tavern and into the Sharn day. The humidity is fierce, as usual, and the stonework slick from the on-and-off again rain. Due to the large distance involved---Highhold is two districts over, a distance of many miles through twisting passages---the group hails a skycab. A few silvers later, they are zooming past the Sharn skyline. [That's 2sp amongst you for the ride]
Highhold is immediately noteworthy from its neighboring towers by the simple fact of dimension---the tower's doors, windows, and floorplans are designed by dwarves, and thus give the place a compact feeling. While roomy enough for gnomes, the bridges between upper stories hang a little lower than is comfortable for most humans. Ducking is usually unnecessary, but a wary eye is always advisable.
Cheep/Aldus directs the group to a lavishly decorated tower, its stonework carved with frescos depicting the arts of commerce and creation. Groundstoner's sits across multiple towers and several stories, catering to craftmasons, artificers, alchemists, and other ilk. It is likely that Aldus gets most of his supplies from the shop.
Cheep leads you all to a counter were a rudy faced dwarf is busy working on one of the more recent puzzlers from the Inquisitive. Cheep/Aldus quickly explains to the dwarf that the group is here on his business, and to extend them the credit he has one file. The shopkeeper nods, and then asks, "How may I be of assistance?"
[You have 150gp of credit, and any non-magical non-armor/weapon equipment, alchemical equipment, and other similar items can be found on hand. Make me a list, and I'll see what they got.]