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In Brussels, the most affordable bootcamp can be found at Elium Academy. The early-bird price for the 3-months bootcamp is €3000. Two different tracks are proposed: "full stack web developer" and "growth hacker". The academy also offers to work on entrepreneurial soft skills. Weekly presentations are given on different topics and a mentor supports students who have a personal entrepreneurial project.
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One of the best full stack software engineering schools I know of is in France. 42 is funded by a French billionaire, so it's completely free to anyone who makes it through the piscine (meaning swimming pool). The first month is designed as a sort of sink or swim approach to software engineering. If you manage to stay afloat, you are assessed and either accepted or denied into the program at that time. Once you are in, the program is super flexible, it should take anywhere from 3-5 years to graduate, and you can go at your own pace. It’s super cool and unique opportunity if you can make it through that first month. I am currently going to a school in San Francisco (Holberton School) that is founded by someone who is good friends at 42, and so I hear about it all of the time. In fact, 42 just opened another campus near San Francisco this past year as well.
If by affordable you don't mean free with extremely hard selection processes like ecole 42; or focused on unemployed or exclusively under 26 audiences like Simplon, I only know 2: www.codingbootcamp.cz and www.elium.academy
The last one is a 12 week bootcamp in Prague with the cost of approximately 2500 euros in full stack web development where you will learn CSS, HTML, jQuery, PHP and MySql.
I think both places provide access to affordable accommodation, I don't know about CodingBootcamp.cz but Elium has an exclusive agreement with SmartFlats, that allow's Elium students to rent a room in amazing apartments downtown brussels (http://elium.academy/students#housing) for 500Euros only, or share one with private bathroom for only 300Euros.
As part of the mission of Elium is to provide its students with job opportunities, Elium also offers 3 scholarships per bootcamp to particularly talented students; no string attached.
Affordability is a tough question. There are lots of options, at a range of prices, but more important is the outcome you desire...
Are you looking to get a job afterwards? Will you have to pay rent soon? An option to consider would be Makers Academy Remote. It's a Remote version of Makers Academy, Europe's #1 Bootcamp, and is half the price of the face to face course.
If employability is a key factor in your decision, then Makers Academy are streets ahead of the pack in that regard. We have designed our business model with the sole intention of aligning our interests with our students interests, and we're the only bootcamp in Europe (and one of the few in the world) still getting paid a fee by companies hiring our students.
For more info, visit remote.makersacademy.com :)
Web Dev Camp is very reasonably priced ( http://webdev.camp/ ) , especially as it includes food and accommodation.
Also it is a unique experience in the finnish nature, and a very focus learning experience due to thte lack of distraction.
If you qualify you can apply for a scholorship of 25 or even 50%. The basic price of 8400€ is very affordable compared to many other schools, especially as it includes accommodation & food.