Here's a Frame (2Rd+d8/2B) and two Stations.
Here's the leftover parts.
At $3.49 and $3.97 respectively, that's roughly $7.50 for a Frame and a Station. Extrapolating that out, it's $22.50 for a Defender size Squad (3 units), $37.50 for an Attacker (5 units), and $52.50 for a Primary Attacker squad (7 units). You also have plenty of leftover parts to convert into SSRs or other Attachments.