It's all about the BBB, baby.
QUOTE (SR4A pg 350 & 351)
Shiawase Kanmushi (Microdrone)
This quad-leg micro-drone "bug" crawler is ideal for penetrating closely confined areas and is capable of crawling on walls and ceilings.
Handling: +1
Acceleration: 2/10
Speed: 10
Pilot: 3
Body: 0
Armor: 0
Sensor: 1
Availability: 8
Cost: ¥1,000
Super cheap fun time! Buts let's slap on these modifications:
Chameleon Coating: 2 slots, ¥1,000
Fuzzy Logic: 1 slot, ¥2,500
Microdrones only get one sensor capacity. Let's fix that.
Improved Sensor Array: 1 slot, ¥1,000
This gives us a minidrone's sensor array, or three capacity for sensors. Yay!
Microphone R6: 1 slot, ¥300 (Enhancements bring Availability to 10)
+Audio Enhancement R3: ¥300
+Select Sound Filter R3: ¥600
Camera R6: 1 slot, ¥600 (Enhancements bring Availability to 12)
+Vision Enhancement R3: ¥300
+Vision Magnification: ¥100
+Low-light Vision: ¥100
+Flare Compensation: ¥50
Radio Signal Scanner R6: 1 slot, ¥150
This gives our drone a Sensor rating of 6. That's basically it's skill in Perception.
Good, the hardware's done, let's give her some software.
Adaptability, Covert Ops, Maneuver, and Clearsight Autosofts R3: ¥6,000 (Total)
Empathy Software R3: ¥600 (Or take it at R6 for ¥3,000)
In total, that's ¥14,600. Not so super cheap fun time anymore. But for 3 BP you can have yourself a useful little spotter buddy and +3 to your Social dice pool. Can costs be shaved down? Of course! But when you're lying prone with one eye squeezed shut and the other focused on your target, wouldn't it be nice to have a more autonomous little buddy hiding in the hallway listening for footsteps and looking for goons/witnesses? I know I would.