The second would be the impact that suppliers, sub contractors and third party individuals can have on the timelines and the budget.

Most window suppliers will have limiters that keep the windows from opening too far.

(for something they paid for and you did not have to do anything except make a phone call to the supplier).

Do you always go with the closest supplier or what?

In the episode, they mentioned how simple it can be to get production started if there's a similar product out there, and you just explain your idea to a supplier of that similar product, which is typically found on Alibaba.

A Hybrid contract of sale... a way to close more transactions by joint venture A commercial contract of sale, 3 pages with special buyer requirements related to environmental conditions, existing suppliers, surveys, buried oil tanks and other conditions that must be known to make a profitable and safe transaction An option agreementAn informational pocket pack with 52 options to financing and control a building without conventional financingBlank checks, pens, carbon paper, A list of referencesDisclosures for lead paint and other state or federal requirementsCell phone with camera to take pictures of the nice things and negative aspects of the property and to take a picture of the contract to email confirmation to seller and to your title company or lenderA gift, something for the seller to remember you by, I give Indian Head Nickels away, pens, note pads.Blank addendum forms - these are used to attach to your purchase agreements (you don't want a lot of chicken scratching on your contracts; use them to write some of the following; 1.

I purchased cabinets (plywood boxes, real wood drawers with dovetail) from our local building supplier and had our GC install them for $500. 

For example: an HVAC installer could charge you as much as $2,000 for a furnace that you could buy directly from the supplier for $500.You need to apprise yourself of the true costs of what you're trying to do, so that you can plan most appropriately for your expenses. 

Then to go t a little more risky here and make some more money, who are Walmart's biggest suppliers?

I'd also suggest you have alternate suppliers and SKU's for your items.