The best bang for the buck is to buy a HDD for each laptop since the same capacity SSD is almost 6x more expensive, though you can get a smaller capacity SSD to reduce the cost such as the following 250GB Samsung SSD for $100. But that may not be enough storage for your needs.
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/www.amazon.com/Samsung-2-5-Inch-Internal-MZ-75E250B-AM/dp/B00OAJ412U/ref=sr_1_4?ie=UTF8&qid=1507048559&sr=8-4&keywords=256gb+2.5%22+ssd
Many people find that when they use a laptop / desktop with a SSD they cannot go back to using one with a hard drive. But for people working with a limited budget, a SSD is considered a luxury.
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The Toshiba Tecra R850-S8510 is an old laptop, but it should be decent enough to spend about $160 + tax (HDD and Windows 10) to get it up and running again if you need to use the laptop. It should have a 2nd generation Intel Core i3 or Core i5 CPU from 2011 which is good enough for basic use.
The Toshiba Satellite C650 (PSC2EU-09C027) may or may not have a similar CPU. It could have an older CPU less powerful since I cannot find any specific information about that laptop model. So it may or may not be worth spending money to get it up and running again.
I would say upgrade the Tecra first to determine if the performance is decent enough for you before you bother with the Satellite.
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On the other hand you can spend $350 on a brand new laptop that really offers good bang for you buck. The following 15.6" Acer has a 7th generation Core i3-7100u and a 1920x1080 resolution screen; pretty decent for the price. Based on reviews the battery life is generally between 5 to 6 hours based on average usage. The two old laptops will likely have very bad battery life, unless the batteries are new.
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/www.amazon.com/Acer-E5-575-33BM-15-6-Inch-Notebook-Generation/dp/B01K1IO3QW/ref=sr_1_3?ie=UTF8&qid=1507050137&sr=8-3&keywords=acer+i3-7100u