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Nope, have NO idea! :D I got most of the dark/light bluish gray, dark red and dark orange bricks directly from Lego, and all the other parts comes from BL in a lot of orders. Add to that parts from several other sets... Expensive, but individually affordable enough. I find the parts hunt just as satisfying. Getting a set in a box is fun too, but actually not as much... So far, I have PC, PR, PS, FB, GG (in sand blue) and GE. (For newbies: Palace Cinema, Parisian Restaurant, Pet Shop, Fire Brigade, Green Grocer and Grand Emporium). I have TH (Town Hall) mostly complete, and CC (Cafe Corner) and MS (Market Street) underway. DO (Detectives Office) later this year. I also got the research institute and have an idea for a building that should fit nicely into the town layout which will incorporate the Research Institute (a bit expanded though). Hopefully, Lego releases a police station, a post office and a bank. The city needs them! :) The Post Office could be combined with a dentist upstairs and a small apartment on the 2nd floor. I think we need a dentist due to the smugglers of sweets and cakes in the DO! :D

Whooops! Somehow I thought 1x2 bricks... :D I have also made quite a few swaps like that. For instance, all the hinge bottoms. They do not show, and I figured that the ones supporting the roof triangles was better in light grey - since the roof itself is light grey. I used sand blue in stead of sand green, and swapped the arches over the windows with medium blue ones. Quite nice! Just found out that the dark blue arch on cafe corner and market street has plummeted in price. Got 2 new ones for €1.89. Now for the dark blue pillars and dark red roof-thingies... I am BL'ing FB, TH, CC and MS. My "blue grocer" is completed, and I have all the other modulars except for DO (will buy later this year though). It is going to be a nice street! :) And I find the "hunt" on BL quite satisfying! It's like christmas every time a bubble envelope dumps into my mailbox! :)

A couple of them can be found in the green band on the wall in the first floor. One to the left of the door if memory serves me right.

I have NO idea if this applies to the cop, but maybe? Just googled "lego cop045 battery replacement" and that video came up. ;) Batteries for the SW figs are CR927 according to the video. Also, one of the comments states that "you can push in the two holes under each arm". Don't blame me if this goes badly. :p

I built the green sand blue grocer a few days ago. Still waiting for some parts, but most of it is finished. I substituted sand green with sand blue, the dark blue arches over the shop windows with light blue (compliments the sand blue nicely) and used a lot of 1x2,4,6 in stead of 1x8 in light bluish gray. Very happy with the look of it! Now on to the other modulars. I intend to do a lot of substitutions there as well; no need to go 100% purist when the prices of some parts are as they are (in my opinion at least). Still need to make interior in the SBG (sand blue grocer) upper floors, and am pondering whether I should do something to the pet shop brown building as well. I could buy some of the modulars in completed sets, but I actually find the hunt for parts very amusing. And in the end, I will end up spending about the same as a complete set - but I can spread it over time. I print out parts lists and have the parts in different bags, and when I order stuff I can go bulk on parts that are used widely. Do not ask me for a quote on the "SBG" - I have no idea! :)