I spent well over $150 if I include the chrome parts. Most of the dress up is easy and availible at most auto parts stores. I personally like Advanced though I couldn't go there for everything. Pepboys had a lot for the tuner cars so it worked out well.
Jeg's - (2) Spectre hose cover kit - $29.99 each (Pepboys $39.99)
(3?)Wire loom color pack - $5-7 each
Wire tires/Electrical tape/Spark plug seperators - $~10
Lowe's - Wire hold downs/fasteners - $10 (Yes Lowe's, in the fastener section you can buy plastic/metal wire hold downs with black or yellow covers. There are black push-pin style fastener that I used to attach the hold downs to the engine bay.)
As for the chrome all was purchased online/on the phone.
(2) Moroso blue valve cover hold down kits - Jegs - $12.99
Chrome valve cover - Mustangs Unlimited - $44.95 (cheaper on Ebay, but I didn't buy it so hehe)
Monte Carlo bar(64.95)/Export Brace(49.95)/Shock tower mounts (64.95) - NPD - $180
K&N Oil breather cap(17.99)/Holley air cleaner ($81.99)- Jegs - $100.
I've got some little things to buy to finish the engine bay - new battery cables, spark plug wires (when MSD is installed), K&N air filter, and maybe some billet.
Hope this helps out.