@Jay Hinrichs Spencer is just on this site to promote himself and his company.

You don't need all of the marketing materials that others have and can save yourself a lot of money by putting them off until you start generating a profit.  

It would be a good material to start with.

Let's promote an environment of networking and mentoring that cost us nothing and karma will reward you. 

Or should he just do the work for his labor and material costs and realize his return on the cash flow ROI of the investment?

Those $400 windows are probably $100-150 each for the materials.  

I'd recommend starting with the vast amount of resources here on BP before you make a decision to purchase any additional training material or programs.

Right now I am looking at Aker CM-60 fiberglass for around $420Aker ACCTS-3360 acrylic for around $800Delta 226032AL00 "Acrylic" $500 (although I've heard that it is just an acrylic layer over other material).Any suggestions of different units or recommendations of things I should be avoiding?

Ok, now that you have taken your initial step, below are some quick links to get engaged.Since your interest lies with wholesaling, I added a guide and a couple podcasts for you to read, listen to and fill the void, while waiting for a local mentor and networking connections.https://www.biggerpockets.com/renewsblog/2015/01/31/ultimate-beginners-guide-real-estate-wholesaling-2/ (Ultimate beginners guide to wholesaling)https://www.biggerpockets.com/renewsblog/2014/10/09/getting-started-real-estate-wholesaler/ (BP Podcast 091 Wholesaling)https://www.biggerpockets.com/renewsblog/2013/10/31/wholesaling-podcast-mike-nelson/ (BP Podcast 042 - wholesaling) http://www.biggerpockets.com/startherehttp://www.biggerpockets.com/meethttps://www.biggerpockets.com/alertsHow to Use @Mentions on BiggerPocketshttps://www.biggerpockets.com/ruleshttps://www.biggerpockets.com/inviteshttps://www.biggerpockets.com/forums/categorieshttps://www.udemy.com/biggerpockets-real-estate-investing-course/ (video with 64 lectures and approx 6hrs of material)https://www.biggerpockets.com/real-estate-investing (Ultimate beginner's guide to REI)REI can be very daunting, but, before you go searching for that 1st buy, please take a few minutes to bone up on the tips in link below.https://www.biggerpockets.com/renewsblog/2014/12/19/real-estate-investing-success-smart-tips/REI books suggested by BPershttps://www.biggerpockets.com/renewsblog/2015/11/13/7-real-estate-books-beginner-investors/ (7 absolute must read books for beginner REI)http://www.biggerpockets.com/renewsblog/2013/04/14/best-real-estate-books/?

I am a new member to the bigger pockets community but have been reading and listening to BP material for a number of months now.